These
Great Rodents Occasionally Frequent The Islands In The Mouth
Of The Plata, Where The Water Is Quite Salt, But Are Far More
Abundant On The Borders Of Fresh-Water Lakes And Rivers.
Near Maldonado Three Or Four Generally Live Together.
In
the daytime they either lie among the aquatic plants, or
openly feed on the turf plain.
[5] When viewed at a distance,
from their manner of walking and colour they resemble pigs:
but when seated on their haunches, and attentively watching
any object with one eye, they reassume the appearance
of their congeners, cavies and rabbits. Both the front and
side view of their head has quite a ludicrous aspect, from
the great depth of their jaw. These animals, at Maldonado,
were very tame; by cautiously walking, I approached within
three yards of four old ones. This tameness may probably
be accounted for, by the Jaguar having been banished for
some years, and by the Gaucho not thinking it worth his
while to hunt them. As I approached nearer and nearer
they frequently made their peculiar noise, which is a low
abrupt grunt, not having much actual sound, but rather arising
from the sudden expulsion of air: the only noise I know
at all like it, is the first hoarse bark of a large dog. Having
watched the four from almost within arm's length (and they
me) for several minutes, they rushed into the water at full
gallop with the greatest impetuosity, and emitted at the
same time their bark. After diving a short distance they
came again to the surface, but only just showed the upper
part of their heads. When the female is swimming in the
water, and has young ones, they are said to sit on her back.
These animals are easily killed in numbers; but their skins
are of trifling value, and the meat is very indifferent. On
the islands in the Rio Parana they are exceedingly abundant,
and afford the ordinary prey to the Jaguar.
The Tucutuco (Ctenomys Brasiliensis) is a curious small
animal, which may be briefly described as a Gnawer, with
the habits of a mole. It is extremely numerous in some
parts of the country, but it is difficult to be procured, and
never, I believe, comes out of the ground. It throws up at
the mouth of its burrows hillocks of earth like those of the
mole, but smaller. Considerable tracts of country are so
completely undermined by these animals, that horses in passing
over, sink above their fetlocks. The tucutucos appear,
to a certain degree, to be gregarious: the man who procured
the specimens for me had caught six together, and he
said this was a common occurrence. They are nocturnal in
their habits; and their principal food is the roots of plants,
which are the object of their extensive and superficial burrows.
This animal is universally known by a very peculiar
noise which it makes when beneath the ground. A person,
the first time he hears it, is much surprised; for it is not
easy to tell whence it comes, nor is it possible to guess what
kind of creature utters it. The noise consists in a short, but
not rough, nasal grunt, which is monotonously repeated
about four times in quick succession: [6] the name Tucutuco is
given in imitation of the sound. Where this animal is
abundant, it may be heard at all times of the day, and sometimes
directly beneath one's feet. When kept in a room, the
tucutucos move both slowly and clumsily, which appears
owing to the outward action of their hind legs; and they are
quite incapable, from the socket of the thigh-bone not having
a certain ligament, of jumping even the smallest vertical
height. They are very stupid in making any attempt to
escape; when angry or frightened they utter the tucutuco.
Of those I kept alive several, even the first day, became
quite tame, not attempting to bite or to run away; others
were a little wilder.
The man who caught them asserted that very many are
invariably found blind. A specimen which I preserved in
spirits was in this state; Mr. Reid considers it to be the
effect of inflammation in the nictitating membrane. When the
animal was alive I placed my finger within half an inch of
its head, and not the slightest notice was taken: it made its
way, however, about the room nearly as well as the others.
Considering the strictly subterranean habits of the tucutuco,
the blindness, though so common, cannot be a very serious
evil; yet it appears strange that any animal should possess
an organ frequently subject to be injured. Lamarck would
have been delighted with this fact, had he known it, when
speculating [7] (probably with more truth than usual with him)
on the gradually _acquired_ blindness of the Asphalax, a
Gnawer living under ground, and of the Proteus, a reptile
living in dark caverns filled with water; in both of which
animals the eye is in an almost rudimentary state, and is
covered by a tendinous membrane and skin. In the common
mole the eye is extraordinarily small but perfect, though
many anatomists doubt whether it is connected with the true
optic nerve; its vision must certainly be imperfect, though
probably useful to the animal when it leaves its burrow. In
the tucutuco, which I believe never comes to the surface of
the ground, the eye is rather larger, but often rendered blind
and useless, though without apparently causing any inconvenience
to the animal; no doubt Lamarck would have said
that the tucutuco is now passing into the state of the
Asphalax and Proteus.
Birds of many kinds are extremely abundant on the undulating,
grassy plains around Maldonado. There are several
species of a family allied in structure and manners to our
Starling: one of these (Molothrus niger) is remarkable from
its habits. Several may often be seen standing together on
the back of a cow or horse; and while perched on a hedge,
pluming themselves in the sun, they sometimes attempt to
sing, or rather to hiss; the noise being very peculiar,
resembling that of bubbles of air passing rapidly from a small
orifice under water, so as to produce an acute sound.
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